IB Chemistry HL 1.3.5 Orbitals and Electron Spin Questions

Build atomic and ionic electron configurations with Aufbau, Hund and Pauli rules, then use orbital diagrams to identify paired and unpaired electrons.

Exam points

Write full or condensed electron configurations for atoms and ions up to Z=36, applying the Aufbau order and Cr/Cu exceptions.
Use orbital box diagrams and Pauli exclusion to place electrons, identify p-orbital capacity and compare isoelectronic arrangements.
Apply Hund’s rule and electron spin to identify paired/unpaired electrons and explain para- or diamagnetism within the Z≤36 scope.

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Study 1.3.5—Orbitals and electron spin conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

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Titanium and vanadium are consecutive elements in the first transition metal series.

State the full electron configuration of the ${ }_{22}^{48} \mathrm{Ti}^{2+}$ ion.

$1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{~d}^{2}$

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IB Chemistry HL 1.3.5 Orbitals and Electron Spin Questions question 1